Right, it looks like I've had some success. nLite successfully integrated the drivers, but couldn't create a complete ISO. I then got hold of cdimage.exe (GUI version) and managed to create the necessary ISO. It wouldn't boot, saying it couldn't find ntldr. I finally found BBIE, extracted the boot image from the original WHS disc and gave that to cdimage to use, finally it worked. I have to say that this reminds me a bit of LInux - using a whole bunch of utilities to get to the end result - but I guess it works in the end, so it's worth it. Hopefully this will help somebody else out - perhaps using oscdimg would also have worked without having to extract the boot image first, but I haven't bothered to try it. So to summarise - use nLite to get everything slipstreamed as you need to, but don't select the create ISO option. Then use BBIE to extract the boot image from the original disc and save it somewhere handy near your working folder (not in it) Use cdimage.exe to create the ISO image, but be sure to point it to the boot image you've saved. For the root folder, select the main folder with all the data inside (in my post above, it was c:\whs). Then use whatever utility you like to write the ISO image - Nero in my case, but Win 7 has its own writer and there are plenty others. Perhaps this is peculiar to this particular flavour of Windows, but maybe someone could incorporate this into the guide as it's certainly not clear as things stand that this approach is required. I have to assume that the other discs are a lot more straightforward and therefore "just work" when following the guide.